Editing Wind speed (section)

==Design of structures==
{{main|Wind engineering}}
[[File:Anemometer_on_stage_set.JPG|thumb|right|Anemometer on an outdoor stage set, to measure wind speed]]

Wind speed is a common factor in the design of structures and buildings around the world. It is often the governing factor in the required lateral strength of a structure's design.

In the United States, the wind speed used in design is often referred to as a "3-second gust", which is the highest sustained gust over a 3-second period having a probability of being exceeded per year of 1 in 50 (ASCE 7-05, updated to ASCE 7-16).<ref>{{Cite web|url=http://www.koreascience.or.kr/journal/AboutJournal.jsp?kojic=KJKHCF|title=Wind and Structures |website=Korea Science|language=ko|access-date=2018-04-18}}</ref> This design wind speed is accepted by most building codes in the United States and often governs the lateral design of buildings and structures.

In Canada, reference wind pressures are used in design and are based on the "mean hourly" wind speed having a probability of being exceeded per year of 1 in 50. The reference [[dynamic pressure|wind pressure]] {{Mvar|q}} is calculated using the equation {{Math|1=''q'' = ''&rho;v''<sup>2</sup> / 2}}, where {{Mvar|&rho;}} is the air density and {{Mvar|v}} is the wind speed.<ref>NBC 2005 Structural Commentaries – Part 4 of Div. B, Comm. I</ref>

Historically, wind speeds have been reported with a variety of averaging times (such as fastest mile, 3-second gust, 1-minute, and mean hourly) which designers may have to take into account. To convert wind speeds from one averaging time to another, the Durst Curve was developed, which defines the relation between probable maximum wind speed averaged over some number of seconds to the mean wind speed over one hour.<ref>ASCE 7-05 commentary Figure C6-4, ASCE 7-10 C26.5-1</ref>